1. In a large saucepan, melt 1 tablespoon of butter over medium heat. Add the chopped onion and garlic, and cook until softened.
2. Add the Arborio rice and stir to coat the grains with the butter. Cook for 2-3 minutes until the rice is slightly translucent.
3. Pour in the white wine and stir until it is mostly absorbed by the rice.
4. Begin adding the warmed broth one ladle at a time, stirring frequently. Wait until the liquid is mostly absorbed before adding the next ladle of broth.
5. Continue this process until the rice is creamy and cooked through, about 18-20 minutes.
6. Stir in the lemon zest, lemon juice, remaining butter, and grated Parmesan cheese. Season with salt and pepper to taste.
7. Remove from heat and stir in the fresh herbs. Serve immediately.